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(C) : Photorespiration is the light-dependent process of oxygenation of ribulose bisphosphate $(RuBP)$ and the release of carbon dioxide by the photos

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photorespiration

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(C) : Photorespiration is the light-dependent process of oxygenation of ribulose bisphosphate $(RuBP)$ and the release of carbon dioxide by the photosynthetic organs of a plant.It leads to the oxidation of a considerable amount of photosynthetic products into $CO_2$ and $H_2O$ without the production of useful energy.Photorespiration occurs significantly in $C_3$ plants because,at high temperatures and high oxygen concentrations,the enzyme $RuBP$ carboxylase acts as $RuBP$ oxygenase.Photorespiration is essentially absent in $C_4$ plants due to their specialized anatomy (Kranz anatomy) which maintains a high $CO_2$ concentration around the enzyme.Peroxisomes and mitochondria are required for completing this process.

The process which makes a major difference between $C_3$ and $C_4$ plants is

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